Vega Strike Code

Fixed parsing of debug level

Fixed uncrustify's mess with background cube vertex data a bit
(only formatting)

Ticket #7: compute and send light solid angles to shader techniques.

Minimum adaptation of highend technique and shaders to account for light size.

NOTE: added light size accounting to diffuse component computation, the effect is noticeable when getting very close to the sun.

To-Do: adapt other techniques, adapt per-vertex lighting to also account for light size.

Ticket #7 - compute and send solid angle to shader techniques

* Added an "ApparentLightSizeArray" autoparam to techniques, see technique.h for details
* Added a light size member to GFXLight (and friends) to be able to track emitter size
* Added required logic in GFXUploadLightState to compute apparent sizes in various forms

Incidently, found and corrected some minor shader-related bugs and some formatting issues.

Fix GFXShaderConstantv functions, they wouldn't link because they were prototyped with unsigned counts but implemented with signed ones.

Update configure.ac script to better check PNG support in light of recent incompatibilities.

Ticket #18: removed use of deprecated libpng functions

About 1/6 of the original cmake warnings squashed. Only a few files with warnings remain.

About another 1/3 of the cmake warnings squashed. As per my previous commit, this needs reviewing and fixing by someone more familiar with the code. There are BUGS here. In mesh_gfx.cpp, for instance, there are two switch statements with conditions but where nothing is done in the bodies. Look at the diff and search for FIXME for bugs; some of which I addressed without knowing what I'm doing, and some of which I couldn't.

merging with safemode branch -r12684